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Increment a Letter


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Hello All,

I am just starting to play with AutoIt and find it very interesting. However I cannot find a way to increment a letter. For example, in my script, I want to map some drive letters. I made an ini file that has the starting drive letter. Let's then say I have four mappings to do. So let's say that in my ini file it has the letter "M". So I want to map "M", "N", "O", and "P". How can I increment M to get N? I could not find this in the help guide or through a Google search. Probably pretty easy but not sure how to do it.



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You have to cast it to an ascii value and then increment, then switch it back to a character. Keep in mind this will not wrap around from Z to a or z to A, so be sure to do some checks on your data so you don't end up trying to access drive [:\ :)

Chr (Asc ("A") + 1)

Edit: Woot! props to Mavis Beacon Posted Image

Edited by Fulano

#fgpkerw4kcmnq2mns1ax7ilndopen (Q, $0); while ($l = <Q>){if ($l =~ m/^#.*/){$l =~ tr/a-z1-9#/Huh, Junketeer's Alternate Pro Ace /; print $l;}}close (Q);[code] tag ninja!

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You want a numeric value for the letter, which you can get from ASC() or ASCW(). Increment by one with the '+= 1' operator. Then convert back to a letter with Chr() or ChrW():

$sLast = "M"
$iASCII = Asc($sLast)
$iASCII += 1
$sNext = Chr($iASCII)
ConsoleWrite("Next letter = " & $sNext & @LF)

That can be shortened, but the longhand method illustrates it better. You would also want some error checking to be sure you didn't go past "Z" and "[" for a mapping letter.


Edit: Out-typed by Fulano, but at least we both beat Melba to it! :lol:

Edited by PsaltyDS
Valuater's AutoIt 1-2-3, Class... Is now in Session!For those who want somebody to write the script for them: RentACoder"Any technology distinguishable from magic is insufficiently advanced." -- Geek's corollary to Clarke's law
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Welcome to the AuotIt forum. :(

Use Asc to get a numeric representation of the letter and then when you have increased it turn it back into a letter with Chr like this:

$sDrive = "M"

$iAscDrive = Asc($sDrive)

MsgBox(0, "ASCII", "m = " & $iAscDrive)

For $i = 1 To 3

    MsgBox(0, "Letters", "Next Drive: " & Chr($iAscDrive + $i))


Ask if anything is unclear.


Public_Domain.png.2d871819fcb9957cf44f4514551a2935.png Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind

Open spoiler to see my UDFs:


ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area


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Np, we're kinda weird, playing with code is fun :(

#fgpkerw4kcmnq2mns1ax7ilndopen (Q, $0); while ($l = <Q>){if ($l =~ m/^#.*/){$l =~ tr/a-z1-9#/Huh, Junketeer's Alternate Pro Ace /; print $l;}}close (Q);[code] tag ninja!

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